Circuit board reinspection equipment with internal light-emitting carrying platform

Abstract

The invention, which relates to the technical field of the reinspection equipment, discloses a circuit board reinspection device with an internal light-emitting carrying platform, comprising: a machine table on which a detection mechanism, a carrying platform mechanism and a driving mechanism for driving the carrying platform mechanism to move horizontally are arranged; the detection mechanism comprises a camera; the carrying table mechanism comprises a carrying table body, a light uniformizing plate and a light source, a mounting cavity is formed in the carrying table body, and a bearing plate is arranged at the top of the mounting cavity of the carrying table body; when the carrying table is used, the light source is arranged in the carrying table body, and the light uniformizing plate is arranged above the light source, so that light rays from the light source uniformly penetrate through the carrying plate to light the circuit board, and the lighting effect is improved; the light source is arranged in the carrying table body, is closer to the circuit board on the bearing plate and is located in a closed environment, so that the lighting effect is better, the carrying table is suitable for finer defect detection, the occupied equipment installation space is smaller, and the overall size of the equipment is reduced due to the built-in light source.

Description

Technical Field

[0001] The present invention relates to the technical field of re-inspection equipment, in particular to a circuit board re-inspection equipment with an internal light-emitting carrier. Background Art

[0002] Printed Circuit Board (PCB) is a key basic component of various electronic devices. Its quality plays a decisive role in the overall performance and reliability of electronic devices. Therefore, strict quality inspection is essential in the production process of circuit boards. At present, there are many inspection technologies for circuit boards, including manual visual inspection, automatic optical inspection (AOI), automatic X-ray inspection (AXI), etc.

[0003] Automatic optical inspection (AOI) technology uses an optical imaging system to capture images of circuit boards, and then uses image processing algorithms to compare and analyze with preset standard images to determine whether the circuit boards have defects. AOI technology has overcome some of the shortcomings of manual visual inspection to a certain extent, has high detection accuracy and efficiency, and can detect a variety of appearance and some hidden defects. However, AOI equipment also has limitations in practical applications. For example, for some complex multi-layer circuit boards, since the inner layer circuits are covered by the outer layer, it is sometimes difficult to fully and accurately obtain the true situation of the inner layer circuits only through optical imaging; and during the detection process, misjudgments or missed judgments may occur due to factors such as lighting conditions, image acquisition angles, and algorithm adaptability. Further review is still required to ensure the accuracy of the test results. In view of the limitations of the above-mentioned detection technology, in the actual process of circuit board production, it is often necessary to re-inspect the circuit boards that have undergone initial inspection to further improve the accuracy of the test results and reduce the risk of defective products flowing out.

[0004] The re-inspection equipment for re-inspecting circuit boards generally uses optical cameras for detection, so the circuit boards need to be illuminated to facilitate taking clearer pictures. Since the carrier needs to adsorb the circuit boards, the light source in the prior art is generally arranged on the outside of the carrier. For example, a light source that irradiates upward is arranged under the transparent carrier to complete the lighting process. However, since the light source is external, the light source is far away from the circuit board and separates the entire carrier. The lighting effect on the circuit board is average, and the external light source will result in the need to occupy more equipment space.

[0005] In view of this, there is an urgent need for a circuit board re-inspection device with an internal light-emitting carrier. Summary of the invention

[0006] In view of the problems existing in the prior art, the present invention solves the problems with the following technical structure.

[0007] To achieve the above object, the present invention adopts the following technical solution:

[0008] A circuit board re-inspection device with an internal light-emitting stage comprises: a machine platform, on which a detection mechanism, a stage mechanism and a driving mechanism for driving the stage mechanism to move horizontally are arranged;

[0009] The detection mechanism includes a camera, and the camera is arranged above the stage mechanism;

[0010] The stage mechanism includes a stage body, a light-diffusing plate and a light source. A mounting cavity is provided in the stage body. A bearing plate is provided on the top of the mounting cavity. A plurality of adsorption holes are provided on the bearing plate and are connected to the mounting cavity. A vacuum pipeline connected to the mounting cavity is provided on the stage body. The bearing plate is a transparent plate.

[0011] The light-diffusing plate is arranged in the installation cavity, the light source is arranged below the light-diffusing plate, and the light-diffusing plate is used to make the light of the light source evenly radiate toward the carrying plate.

[0012] It is further characterized in that

[0013] The vacuum pipeline is arranged at the bottom of the carrier body.

[0014] The light-distributing plate divides the installation cavity into an upper cavity and a lower cavity, and an air passage for maintaining the communication between the upper cavity and the lower cavity is reserved on the ring side of the light-distributing plate.

[0015] A ring plate is arranged on the ring side of the installation cavity, the light averaging plate is arranged on the inner side of the ring plate, a plurality of air grooves extending from top to bottom are evenly arranged on the inner side of the ring plate, and a plurality of the air grooves form an air channel.

[0016] A plurality of supporting blocks distributed in a rectangular array are arranged at the bottom of the installation cavity, and the light averaging plate is arranged on the top of the plurality of supporting blocks.

[0017] The light source includes a plurality of light beads evenly distributed at the bottom of the mounting cavity.

[0018] The top surface of the carrier plate is provided with two scales extending in directions perpendicular to each other, and the top surface of the carrier plate is provided with two optical reference points for locating defects.

[0019] The driving mechanism includes a sliding frame, a screw rod and a motor, wherein the sliding frame is arranged on the machine platform, the screw rod is rotatably arranged on the sliding frame, and the motor is used to drive the screw rod to rotate;

[0020] The platform body is slidably arranged in the sliding frame, and a connecting piece is arranged at the bottom of the platform body. The connecting piece is sleeved on the screw rod and is threadedly connected with the screw rod.

[0021] The detection mechanism also includes a mounting seat, a horizontal moving module and a height adjustment module, the camera is arranged on the mounting seat, the horizontal moving module is placed horizontally above the stage mechanism, the height adjustment module is vertically arranged on the horizontal moving module, and the mounting seat is arranged on the height adjustment module.

[0022] A code reader and a laser positioning light are arranged on the mounting seat.

[0023] The above structure of the present invention can achieve the following beneficial effects:

[0024] When in use, the circuit board is placed on the top surface of the carrier plate, and the installation cavity is evacuated through the vacuum pipeline to make the circuit board adsorbed on the top surface of the carrier plate. The driving mechanism drives the stage mechanism to move horizontally so that the circuit board passes directly under the camera, and the camera takes pictures and detects the circuit board on the carrier plate. Since the light source is arranged inside the stage body and a light-emitting plate is arranged above the light source, the light from the light source can be evenly transmitted through the carrier plate to illuminate the circuit board and improve the lighting effect. Since the light source is arranged inside the stage body, it is closer to the circuit board on the carrier plate and is in a closed environment, so the lighting effect is better and it is suitable for more sophisticated defect detection. Moreover, since the light source is built-in, the equipment installation space occupied is smaller, thereby reducing the overall volume of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of this application;

[0026] Figure 2 It is a schematic diagram of the structure of the testing organization in this application;

[0027] Figure 3 It is a schematic diagram of the structural cross section of the stage mechanism in this application;

[0028] Figure 4 It is a structural schematic diagram of the carrier body in this application;

[0029] Figure 5 Schematic diagram of the internal structure of the carrier body in this application;

[0030] Figure 6 This is a schematic diagram of the bottom structure of the carrier body in this application;

[0031] Figure 7 It is a schematic diagram of the top structure of the stage mechanism and the driving mechanism in this application;

[0032] Figure 8 It is a schematic diagram of the bottom structure of the stage mechanism and the driving mechanism in this application.

[0033] In the figure: 1. machine; 2. detection mechanism; 21. camera; 22. mounting seat; 23. horizontal movement module; 24. height adjustment module; 25. code reader; 26. laser positioning light; 3. stage body; 31. load-bearing plate; 32. vacuum pipeline; 33. scale; 34. optical reference point; 35. support block; 4. homogenizing plate; 5. light source; 6. ring plate; 61. air groove; 7. driving mechanism; 71. sliding frame; 72. screw rod; 73. motor. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0035] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product or equipment comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0036] The following is combined with Figure 1-Figure 8 This application is described in further detail.

[0037] refer to Figure 1-Figure 4 A circuit board re-inspection device with an internal light-emitting stage is shown, comprising: a machine platform 1, on which a detection mechanism 2, a stage mechanism, and a driving mechanism 7 for driving the stage mechanism to move horizontally are arranged; the detection mechanism 2 comprises a camera 21, and the camera 21 is arranged above the stage mechanism;

[0038] The stage mechanism includes a stage body 3, a light homogenizing plate 4 and a light source 5. A mounting cavity is provided in the stage body 3. A carrying plate 31 is provided on the top of the mounting cavity of the stage body 3. A plurality of adsorption holes penetrating the mounting cavity are provided on the carrying plate 31. A vacuum pipeline 32 communicating with the mounting cavity is provided on the stage body 3. The carrying plate 31 is a transparent plate (such as a light-transmitting acrylic plate, or made of materials such as PC plate, PETG plate, etc.);

[0039] The light-diffusing plate 4 is disposed in the installation cavity, and the light source 5 is disposed below the light-diffusing plate 4 . The light-diffusing plate 4 is used to make the light from the light source 5 evenly radiate toward the carrying plate 31 .

[0040] Based on the above structure, when in use, the circuit board is placed on the top surface of the carrier plate 31, and the installation cavity is evacuated through the vacuum pipeline 32 so that the circuit board is adsorbed on the top surface of the carrier plate 31. The driving mechanism drives the stage mechanism to move horizontally so that the circuit board passes directly under the camera 21. The camera 21 shoots and detects the circuit board on the carrier plate 31. Since the light source 5 is arranged inside the stage body 3 and a light-homogenizing plate 4 is arranged above the light source 5, the light from the light source 5 can be evenly transmitted through the carrier plate 31 to illuminate the circuit board and improve the lighting effect. Since the light source 5 is arranged inside the stage body 3, it is closer to the circuit board on the carrier plate 31 and is in a closed environment (the stage body 3 except the carrier plate 31 can be made of opaque material), so the lighting effect is better and it is suitable for more sophisticated defect detection. Moreover, since the light source 5 is built-in, the equipment installation space occupied is smaller, thereby reducing the overall volume of the equipment.

[0041] like Figure 2-Figure 6 As shown, the vacuum pipeline 32 is arranged at the bottom of the carrier body 3. The advantage of this treatment is that it does not occupy the space on both sides of the carrier body 3. Since the vacuum pipeline 32 is arranged at the bottom of the carrier body 3, in order to ensure that the installation cavity is vacuumed when the circuit board is vacuumed, the light-dispersing plate 4 divides the installation cavity into an upper cavity and a lower cavity, and an airway is left on the ring side of the light-dispersing plate 4 to maintain the connection between the upper cavity and the lower cavity. In this way, when vacuuming, the air in the upper cavity is evacuated through the airway, thereby ensuring the realization of the vacuum adsorption function of the circuit board. In order to improve the efficiency of vacuuming, the ring side of the installation cavity is provided with A ring plate 6 is provided, and a light-dispersing plate 4 is arranged on the inner side of the ring plate 6. A plurality of air grooves 61 extending from top to bottom are evenly arranged on the inner side of the ring plate 6. The plurality of air grooves 61 form an air channel. In this way, a plurality of air grooves 61 are evenly arranged on the ring side of the light-dispersing plate 4 (that is, the inner side of the ring plate 6 is in a continuous wave shape). When vacuuming, the air in the upper cavity is evenly extracted from the ring side of the light-dispersing plate 3, thereby improving the efficiency of vacuuming and ensuring the uniformity of the negative pressure adsorption force applied to various parts of the bottom surface of the circuit board, thereby avoiding the problem that the adsorption force on one side of the circuit board is larger and the adsorption force on the other side is smaller at the same time.

[0042] Further optimization is that Figure 5 As shown, in order to ensure the stability of the light-distributing plate 4 during operation, a plurality of support blocks 35 distributed in a rectangular array are provided at the bottom of the installation cavity. The light-distributing plate 4 is arranged on the top of a plurality of support blocks 35 to uniformly support various parts of the light-distributing plate 4 to avoid movement of the light-distributing plate 4 during vacuuming, and the support blocks 35 can be made of a light-transmitting material to avoid interference with the light of the bottom light source 5.

[0043] Further optimization is that Figure 2 As shown, the light source 5 includes a plurality of light beads evenly distributed at the bottom of the mounting cavity, and a plurality of light beads are densely distributed below the light-diffusing plate 4, so as to further improve the lighting efficiency of the circuit board.

[0044] like Figure 7 As shown, in order to facilitate the positioning of defects during camera detection, the top surface of the carrier plate 31 is provided with two scales 33 extending in directions perpendicular to each other, and the top surface of the carrier plate 31 is provided with two optical reference points 34 for locating defects, so as to facilitate the positioning of circuit board defects.

[0045] like Figure 7 and Figure 8 As shown, in order to complete the driving of the stage mechanism, the driving mechanism 7 includes a sliding frame 71, a screw rod 72 and a motor 73. The sliding frame 71 is set on the machine 1, the screw rod 72 is rotatably set on the sliding frame 71, and the motor 73 is used to drive the screw rod 72 to rotate; the stage body 3 is slidably set in the sliding frame 71, and a connecting piece is set at the bottom of the stage body 3. The connecting piece is sleeved on the screw rod 72 and is threadedly connected with the screw rod 72. In this way, the stage body 3 is slidably set on the slide rail on the sliding frame 71, and the screw rod 72 is driven to rotate by the motor 73, so that the stage body 3 slides horizontally and reciprocates under the camera 21.

[0046] like Figure 2 As shown, the detection mechanism 2 also includes a mounting seat 22, a horizontal moving module 23 and a height adjustment module 24, the camera 21 is arranged on the mounting seat 22, the horizontal moving module 23 is horizontally placed above the stage mechanism, the height adjustment module 24 is vertically arranged on the horizontal moving module 23, and the mounting seat 22 is arranged on the height adjustment module 24; a code reader 25 and a laser positioning light 26 are arranged on the mounting seat 22, and the code reader 25 is used to read the code of the product passing directly under the camera 21; the laser positioning light 26 provides accurate positioning and marking functions; when re-inspecting different products, the height of the camera 21 is adjusted by the height adjustment module 24; the horizontal position of the camera 21 is adjusted by the horizontal moving module 23, thereby completing the position adjustment of the camera 21, so as to adapt to the re-inspection work of different products and improve the re-inspection efficiency and versatility of the equipment.

[0047] Working principle of the present invention: when in use, the circuit board is placed on the top surface of the carrier plate 31, and the installation cavity is evacuated through the vacuum pipeline 32 so that the circuit board is adsorbed on the top surface of the carrier plate 31. The driving mechanism drives the stage mechanism to move horizontally so that the circuit board passes directly under the camera 21. The camera 21 photographs and detects the circuit board on the carrier plate 31. Since the light source 5 is arranged inside the carrier body 3 and a light-homogenizing plate 4 is arranged above the light source 5, the light from the light source 5 can be evenly transmitted through the carrier plate 31 to illuminate the circuit board and improve the lighting effect. Since the light source 5 is arranged inside the carrier body 3, it is closer to the circuit board on the carrier plate 31 and is in a closed environment, so the lighting effect is better and it is suitable for more sophisticated defect detection. Moreover, since the light source 5 is built-in, the equipment installation space occupied is smaller, thereby reducing the overall volume of the equipment.

[0048] The above are only preferred embodiments of the present application, and the present invention is not limited to the above embodiments. It is understood that other improvements and changes directly derived or associated by those skilled in the art without departing from the spirit and concept of the present invention should be considered to be included in the protection scope of the present invention.

Claims

1. A circuit board re-inspection device with an internal light-emitting stage, characterized in that: include: A machine platform (1), wherein the machine platform (1) is provided with a detection mechanism (2), a platform mechanism, and a driving mechanism (7) for driving the platform mechanism to move horizontally; The detection mechanism (2) comprises a camera (21), and the camera (21) is arranged above the stage mechanism; The platform mechanism comprises a platform body (3), a light homogenizing plate (4) and a light source (5); a mounting cavity is arranged inside the platform body (3); a bearing plate (31) is arranged on the top of the mounting cavity of the platform body (3); a plurality of adsorption holes penetrating the mounting cavity are arranged on the bearing plate (31); a vacuum extraction pipeline (32) communicating with the mounting cavity is arranged on the platform body (3); and the bearing plate (31) is a transparent plate; The light-diffusing plate (4) is arranged in the installation cavity, the light source (5) is arranged below the light-diffusing plate (4), and the light-diffusing plate (4) is used to make the light of the light source (5) evenly radiate toward the supporting plate (31).

2. The circuit board re-inspection equipment with an internal light-emitting stage according to claim 1, characterized in that: The vacuum extraction pipeline (32) is arranged at the bottom of the carrier body (3).

3. The circuit board re-inspection equipment with an internal light-emitting stage according to claim 2, characterized in that: The light-distributing plate (4) divides the installation cavity into an upper cavity and a lower cavity, and an air passage for maintaining the upper cavity and the lower cavity connected is reserved on the ring side of the light-distributing plate (4).

4. The circuit board re-inspection device with an internal light-emitting stage according to claim 3, characterized in that: A ring plate (6) is arranged on the ring side of the installation cavity, the light-distributing plate (4) is arranged on the inner side of the ring plate (6), and a plurality of air grooves (61) extending from top to bottom are evenly arranged on the inner side of the ring plate (6), and the plurality of air grooves (61) form an air channel.

5. The circuit board re-inspection equipment with an internal light-emitting stage according to claim 3, characterized in that: A plurality of support blocks (35) distributed in a rectangular array are arranged at the bottom of the installation cavity, and the light homogenizing plate (4) is arranged on the top of the plurality of support blocks (35).

6. The circuit board re-inspection equipment with an internal light-emitting stage according to claim 1, characterized in that: The light source (5) comprises a plurality of light beads evenly distributed at the bottom of the installation cavity.

7. The circuit board re-inspection equipment with an internal light-emitting stage according to claim 1, characterized in that: The top surface of the carrier plate (31) is provided with two scales (33) extending in directions perpendicular to each other, and the top surface of the carrier plate (31) is provided with two optical reference points (34) for facilitating defect positioning.

8. The circuit board re-inspection equipment with an internal light-emitting stage according to claim 1, characterized in that: The driving mechanism (7) comprises a sliding frame (71), a screw rod (72) and a motor (73); the sliding frame (71) is arranged on the machine platform (1); the screw rod (72) is rotatably arranged on the sliding frame (71); and the motor (73) is used to drive the screw rod (72) to rotate; The platform body (3) is slidably arranged in the sliding frame (71), and a connecting piece is arranged at the bottom of the platform body (3). The connecting piece is sleeved on the screw rod (72) and is threadedly connected to the screw rod (72).

9. The circuit board re-inspection equipment with an internal light-emitting stage according to claim 1, characterized in that: The detection mechanism (2) further comprises a mounting seat (22), a horizontal moving module (23) and a height adjustment module (24); the camera (21) is arranged on the mounting seat (22); the horizontal moving module (23) is horizontally placed above the platform mechanism; the height adjustment module (24) is vertically arranged on the horizontal moving module (23); and the mounting seat (22) is arranged on the height adjustment module (24).

10. The circuit board re-inspection equipment with an internal light-emitting stage according to claim 9, characterized in that: The mounting seat (22) is provided with a code reader (25) and a laser positioning light (26).

Images